Often, you’ll need some users with data like picture and manager in your new development environment. Since you usually recycle your dev AD, this doesn’t happen frequently. But if you have to set up a new domain, you’ll want testusers with data.
I don’t want to search again, because I found a great resource for creating users here: http://mrhodes.net/2011/10/25/adding-285-contoso-users-with-pictures-to-your-development-environment-active-directory/
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